The 1922 Olympia Show.
O.K. (Stand 79.)
Four-Strokes and Two-Strokes.
2¾ H.P. Model.
71x88 mm. (348 c.c); single cyl. four-stroke; overhead valves: drain feed lubrication : Amac carb.; chain-driven mag.; 3-sp. gear; clutch and kick-starter; chain drive; 26x2½in. tyres. Price: Solo, £76.
Few better examples of the 350 c.c. solo mount are to be seen in the Show than the 348 c.c. Blackburne-engined O.K. Built on thoroughly conventional lines, well mudguarded, and with many points of convenience well studied, it should appeal to the sporting rider. The gear box fixture is worthy of note, since not only is there a longitudinal adjustment by means of a drawbolt, but set screws allow a certain variation to be made so that perfect chain alignment may be ensured.
The side valve-engined model is similar in every detail except the engine, the addition of footboards, and slight modifications in the silencing arrangements. The side valve model costs £65 10s., or with two speeds only £55 10s. The three-speed with sidecar costs £83.
2¾ H.P. Model.
70x76 mm. (292 c.c) single cyl. two-stroke; drip-feed lubrication; Senspray carb.; chain-driven mag.: single gear: direct belt drive; 26x2¼in. tyres. Price: Solo, £35.
Quite the most attractive feature about this machine is its price. It is nevertheless well constructed, and a good example of the simplest form of motor bicycle. The tank has a solid pressed steel nose, and this year the model has been improved by the fitting of adjustable footrests, while the heel-operated brake pedal can be similarly adjusted to conform therewith.
2¾ H.P. Model.
70x76 mm. (292 c.c); single cyl. two-stroke: drip feed lubrication: Amac carb. : chain-driven mag.; 3-sp. gear; clutch and kick-starter: all-chain drive: 26x2½in. tyres. Price: Solo, £56 10s.; with Sidecar, £74 10s.
For a long time Humphries and Dawes, Ltd., have specialised in the low-powered inexpensive sidecar outfit, which they have brought to a high degree of perfection. Their latest model 292 c.c. sidecar outfit is a thoroughly well-thought-out machine. The gear box fixing and adjustment are carried out in the same manner as in the Blackburne-engined model. With this machine comfortable aluminium foot-boards are provided, and a very excellent system of silencing the exhaust, the expansion chamber being beneath the crank case of very large dimensions and divided into two halves, and L-shaped. The exhaust gases pass through a very long exit pipe with flattened ends. A compensating shoe brake applied to a dummy belt rim is fitted to the rear wheel, while on the front is an internal expanding brake of the firm's own design. This is a very nice piece of work, and is provided with a felt washer to exclude oil from the bearing surfaces.
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